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Summary of Status of Partnership's Unvested Equity-Based Awards (Detail)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Blackstone Partnership Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vested (Units) (387,805,088)
Ending Balance 439,711,537
Blackstone | Blackstone Partnership Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance 33,498,237
Granted (Units) 28,861,922
Vested (Units) (19,845,114)
Forfeited (Units) (1,613,290)
Ending Balance 40,901,755
Beginning Balance | $ / shares $ 26.19
Granted (Weighted-Average Grant Date Fair Value) | $ / shares 37.91
Vested (Weighted-Average Grant Date Fair Value) | $ / shares 29.48
Forfeited (Weighted-Average Grant Date Fair Value) | $ / shares 23.31
Ending Balance | $ / shares 32.98
Blackstone Group L P | Equity Settled Awards Weighted Average Grant Date Fair Value  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance | $ / shares 16.95
Granted (Weighted-Average Grant Date Fair Value) | $ / shares 32.98
Vested (Weighted-Average Grant Date Fair Value) | $ / shares 17.62
Exchanged (Weighted-Average Grant Date Fair Value) | $ / shares 28.23
Forfeited (Weighted-Average Grant Date Fair Value) | $ / shares 24.82
Ending Balance | $ / shares 22.38
Blackstone Group L P | Cash Settled Awards Weighted Average Grant Date Fair Value  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance | $ / shares 31.95
Granted (Weighted-Average Grant Date Fair Value) | $ / shares 34.03
Vested (Weighted-Average Grant Date Fair Value) | $ / shares 32.62
Exchanged (Weighted-Average Grant Date Fair Value) | $ / shares 28.23
Ending Balance | $ / shares $ 28.79
Blackstone Group L P | Equity Settled Awards Deferred Restricted Common Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance 17,569,372
Granted (Units) 5,655,007
Vested (Units) (7,942,152)
Exchanged (Units) (10,374)
Forfeited (Units) (929,724)
Ending Balance 14,342,129
Blackstone Group L P | Cash Settled Awards Phantom Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance 1,455
Granted (Units) 16,928
Vested (Units) (815)
Exchanged (Units) 10,374
Ending Balance 27,942